The shatter-proof polycarbonate bottles contain the chemical bisphenol A which health officials warn mimics the hormonal activity of estrogen and can alter the normal workings of genes.

The baby products industry has argued that bisphenol A levels in humans were too low to cause damage.

However, studies in lab animals indicate that even small amounts of bisphyenol A can damage brain and reproductive systems, alter mammary and prostate glands and lead to heart disease, obesity and diabetes.

Blumenthal has called for legislation that would further restrict the chemical in baby products.